A tap is usually hard to turn because limescale or grit has built up inside the valve, or because the cartridge or headgear that controls the flow has started to wear. Less often, a stiff handle comes from a fixing that has been over-tightened or a part that has slipped out of line.
A tap that is becoming stiff is worth looking at early. If it is forced, the internal parts can crack or the handle can break.
Common Reasons a Tap Gets Stiff
Limescale is one of the most common causes in hard water areas. Minerals in the water slowly build up on the moving parts inside the tap, so they rub instead of sliding smoothly.
Many modern taps use a ceramic disc cartridge. These turn a quarter or half turn from off to fully on. When the discs or the seals around them wear or gather debris, the handle can feel gritty or tight.
Older taps with rising spindles and washers may stiffen when the spindle is dry, worn or corroded. Some lever mixer taps have a single cartridge that controls both flow and temperature, and this can also become stiff with age.
What Different Symptoms May Mean
A tap that is stiff all the way through its turn may have scale or wear inside the cartridge. A tap that turns freely then catches at one point may have a damaged part.
If the handle feels loose and stiff at the same time, a fixing screw may be loose, letting the handle sit at an angle. A tap that only became stiff after recent work could have been over-tightened. None of these signs proves the exact fault, but they can help a plumber narrow it down.
What to Avoid
Do not use pliers or a wrench on the handle to force it. This can snap the spindle, crack a ceramic cartridge or damage the finish.
Avoid spraying oils or household lubricants into the tap, as some are not suitable for drinking water fittings. Harsh descalers can also damage chrome and other finishes, so check the tap maker’s guidance before using any cleaning product.
If a stiff tap will not turn off fully, close the small isolation valve on the pipe beneath it, if there is one and it turns easily, or use the stopcock.
Getting It Fixed
A stiff tap can often be repaired by cleaning or replacing the cartridge or headgear rather than the whole tap. The right part depends on the make and model, so it helps to know the brand or have a photo of the tap.
If the tap is old or parts are no longer available, replacement may be the more practical choice. If one of your taps is getting harder to use, our tap repair service in Oxford can find out what is causing the stiffness and suggest whether a repair or a new tap makes more sense.